Chromatic tuner · iOS
Centz
In tune. In colour.
A fast, accurate tuner with a colour for every note. The meter snaps to a single green the instant your string lands — on guitar, bass, ukulele and banjo, on violin, viola, cello, double bass and mandolin, or on anything at all in chromatic mode.
What it does
Tunings for every instrument
Guitar, bass, ukulele and banjo, the 12-string, the 7- and 8-string and baritone guitars, the tenor ukulele, and the orchestral strings — standard plus drop, open and alternate tunings, each string in its colour. Standard · Drop D · DADGAD · Drop C · E♭ standard
Reference pitch
Tune to any concert pitch from A = 430 to 446 Hz, with one-tap presets for 432, 440 and 442. A = 432 · A = 440 · A = 442
Hears it on-device
Listens through the mic and analyses pitch live on your phone — nothing is ever recorded or sent anywhere. Live · Private · Haptic
The meter
Green means in tune.
A second colour channel reads accuracy, not pitch. The LED meter runs amber while you’re off and resolves to one clean green the moment you’re within four cents — no numbers to read, no guessing.
Way off
Segments light wide in red the further your string sits from the target pitch.
Closing in
Amber narrows toward the centre as you turn the peg the right way.
In tune
A single tall green bar and a soft haptic the instant you land it.
Questions
Which instruments can Centz tune?
Guitar, bass, ukulele and banjo, the 12-string, the 7- and 8-string and baritone guitars, the tenor ukulele, and violin, viola, cello, double bass and mandolin — each with standard plus drop, open and alternate tunings, and every string in its own colour. Auto mode finds the string for you, or pick it yourself. Chromatic mode tunes anything at all, with no instrument selected.
How accurate is the tuner?
Centz reads pitch to within a few cents and locks to a single clean green the moment you land it. A fine mode zooms the meter in on the last few cents for a precise setting.
Can I change the reference pitch?
Yes. Tune to any concert pitch from A = 430 to 446 Hz, with one-tap presets for 432, 440 and 442 Hz.
Does Centz record me or need the internet?
No. Centz listens through the microphone and analyses pitch live on your device — nothing is ever recorded or sent anywhere, and it works fully offline.
Is Centz free?
Yes. Centz is free with a standard tuning on every instrument it supports — open G on the banjo — and chromatic mode is free too. Centz Pro is a one-time purchase that unlocks the alternate tunings — sixteen of them, twelve for guitar alone: Drop D, DADGAD, Drop C, Drop B, E♭ standard, the open family and more — with no subscription, ever.
Also in the line
The other apps that go with it.
